Thought these pics might help. I did the strip type from trailing edge stock I got from the LHS. They are easy to do and if you make them this length you will get a Senior that turns crisp and is very responsive. I put in only 2 inches total of dihedral (6 inches specified in the manual) and people are amazed at how well this plane flys. With flapperons I can stop the Senior dead in the sky above the field and hold it there forever with a slight breeze.

Good luck with yours